The Effect Of A Cell's Size And Its Ability To Diffuse Materials Sbi4 Ue Biology Lab

2068 words - 9 pages

September 27th, 2017
Purpose: To see the relationship between cell size and diffusion of materials.
· Phenolphthalein agar
· Ruler
· 0 .1M sodium hydroxide (NaOH) solution
· Scalpel or knife
· 400-ml beaker
· Spoon
· Safety goggles.
In this lab, blocks of phenolphthalein agar were used to imitate and demonstrate the properties of cells and its ability to move materials into and out of its membrane. This lab helped visualize and recreate the process of a passive transport system whereby cells can move small particles through the lipid bilayer of its cell membrane. This passive process is known as diffusion. Diffusion is a passive process as it requires no energy to move the materials around. The particles can freely enter and exit the membrane in the presence of a concentration gradient, albeit in a random fashion; as the movement of particles in diffusion are random. A concentration gradient occurs when one area contains a higher concentration of a substance and a lower concentration in another. This allows for particles to diffuse from areas of high concentrations to low concentrations, until the concentration gradient reaches equilibrium.
Three differently sized blocks of agar were placed in a sodium hydroxide solution to allow for the solution to diffuse into the blocks. This allowed for different results between the blocks as they had different densities and had either a higher or lower number of particles per unit volume. The blocks were then cut open and measurements were recorded. By observing the coloured areas inside of the blocks, it showed the extent of diffusion of the solution into the cubes.
The blocks of agar were composed of phenolphthalein, a commonly used compound as a pH indicator in acid-base titrations. The properties of phenolphthalein enable it to turn solutions pink when exposed to an alkaline solution. The phenolphthalein modelled the diffusion of materials out of the cells whereas the sodium hydroxide solution represented the diffusion of materials into a cell. Although there are multiple factors that can affect diffusion, namely temperature, concentration and pressure – this lab focused primarily on density, as it modeled the effect that cell size can have on diffusion.
Data Processing
Data Table 1. The calculated results for the total volume of the cube, the uncoloured area, the coloured area. Also included: Volume of Coloured Area/Total Volume of Cube and Percentage of Cube NaOH diffused.
Intended Total Volume of cube (cm3)
Actual Total Volume of cube (cm3)
Volume of Uncoloured Area (cm3)
Volume of Coloured Area(cm3)
Volume of Coloured Area/Total Volume of cube
Percentage of cube NaOH(aq) diffused
Sample Calculations (done with cube 3)
Calculating the Actual Volume of the Cube
Calculating the Volume of the Uncoloured Area
Calculating the Volume of the Coloured Area
Calculating the Ratio...

Find Another Essay On The effect of a cell's size and its ability to diffuse materials - SBI4UE - Biology Lab

The Media and its Ability to Control the Image of Perfection

1824 words - 8 pages an eating disorder. By limiting the source of negativity, parents can diminish the effect that it has on the user, so stopping access to the media will diminish its ability to cause negative body image and ultimately eating disorders. The media will never stop distributing photoshopped images to the public, so it is in the hands of the parents and guardians of children to protect and educate about what healthy actually is, and that the media’s

Biology HL Practical The "capture-mark-release-recapture" technique as a means of measuring population size

1335 words - 5 pages that decide the size of the population. Since our scoops claimed only small numbers of beads N1 and N2 were low and hence we gained really low population sizes.I believe that the low count on the scoops is due to bad experimental techniques. The absence of the sand in the tray would be more beneficial and provide a more accurate experiment. This is because in real life capture mark release recapture methods, a grid randomly selects a square for

TO TEST THE EFFECTS OF ANTACIDS ON PEPSIN'S ABILITY TO DIGEST PROTEIN. Biology report - minus introduction, discussion & conclusion

1808 words - 7 pages further health problems (Stein Carter, 2004). Regular consumption of antacids increases the amount of acid secreted to restore the stomach to a normal pH which can prevent proper digestion and interfere with the absorption of nutrients. This can cause indigestion and thus makes it unfavourable for the casual use of antacids.2.3 HypothesisAntacids will hinder pepsin's ability to digest protein depending on their concentration.It can be suggested that

The Concentration of Sugar in the Cell Sap of a Potato Cell's Vacuole

1898 words - 8 pages The Concentration of Sugar in the Cell Sap of a Potato Cell's Vacuole Plan In this experiment I am intending to investigate the concentration of sugar in the cell sap of a potato-cell's vacuole. I will discover this using my knowledge of the biological process of Osmosis. Osmosis is the movement of solvent (usually water) through a semi

The Functions and Materials of a Fuel Cell

1229 words - 5 pages produce water and electrons to be transported to the cathode via the external circuit. Heat might be generated at the anode when using a hydrocarbon fuel. Materials: Cathode feed channel (Air) and anode feed channel (Fuel): They are mainly constructed from ceramic, as the ceramic is available and not expensive. Interconnects: LaCrO3 doped with different elements (e.g: Ca, Mg, Sr, etc.) to improve its conductivity could be used as a constructed

DNA lab write-up. Includes Introduction. Contains materials used in lab, and the steps taken

806 words - 3 pages I.IntroductionDNA is short for Deoxyribonucleic Acid. DNA is a molecule that forms your chromosomes and genes, and contains all of your genetic material. It is contained in the nucleus of all the cells in your body. Although they may be in all your cells, the cell has the ability to turn off or on that particular gene. Thus you don't get a brain in your foot. Because no two people have the same DNA, excluding Identical Twins, the world today

Biology Lab Report On The Effects Of Adrenalin On A Daphnia

1450 words - 6 pages AbstractFor this experiment we tested the effects of different adrenalin concentrations (0.001%; 0.01%; 0.1%) on the daphnia flea. The daphnia was placed on a slide with cover slip in order to examine its heartbeat by using the microscope.AimIn this Lab we will study the effect of different concentrations of adrenalin on the heart rate daphnia, the water flea.It is expected to recognize a threshold of the daphnia in its reaction the three


1248 words - 5 pages for spherical particles. As previous methods lack the ability to work for wide size ranges. An example of using a model that is not 3D model is shown in the paper8 by Webb and Davis. They use a reduced-dimension algorithm, although they do stress that this may not always be able to replace a 3D algorithm. A linear mixture packing model was explored by Yu and Standish10 in a study of the packing of particles. Previous investigations are limited in

Use Examples To Evaluate The Optimum Size Of A Firm

857 words - 3 pages stripping) and utilise economies of scale.牋牋牋牋Economies of scale are one of the reasons why companies choose to expand. Economies of Scale are where when a company grows, it can take advantage of its size in bulk discounts, machine utilisation etc. However once a company reaches a certain size than diseconomies of scale start to predominate over economies of scale. Diseconomies of scale can be caused by thing such as

Cancer Cell Metastasis and How Cells Diffuse Into Diverse Parts of the Body

947 words - 4 pages materials, and so on. These cells, in order for the organ to function properly, must be replaced when resources within the cell have been worn out. An internal feedback system controls cell division by balancing the number of old and dying cells against the progeny of the stem cells (Columbia). It was recently shown that unattached cells in tissues, are growth inhibited due to a nuclear protein called E-CDK2 (Scientists). This complex regulates

To determine the effect of substrate concentration on the activity of the enzyme amylase. - Biology - Assignment

1466 words - 6 pages Biology Assessment Task 1 Aim: To determine the effect of substrate concentration on the activity of the enzyme amylase. Hypothesis: As the substrate concentration increases, the activity increases. However after certain concentration of substrate, the activity remains same because of saturation of Active site on Enzyme with substrate Molecules. Materials: · 4 test tubes · test tube rack · 10mL measuring cylinder · stopwatch · 2 50mL beakers

Similar Essays

How P H Affects An Enzyme's Ability To Catalyze Honors Biology I Lab Report

943 words - 4 pages 2 How pH Affects an Enzyme’s Ability to Catalyze How pH Affects an Enzyme’s Ability to Catalyze Kayah Takei and Annelise Kofod Durham Museum of Life and Science Honors Biology I Abstract The purpose of our lab was to demonstrate how pH affects the productivity of enzymes. In our lab, we tested how changing the pH of our enzyme, lactase, affected its ability to catalyze its substrate, lactose. We tested the enzyme’s ability to function by using

The Effect One’s Gender And Personality Has On Their Ability To Identify The Emotion And Gender Of A Face

1542 words - 6 pages human beings, the importance of interpreting emotions is unchallenged. The ability to understand the feelings expressed by others is thought to be a natural part of growing up. From the early age of 6 months, infants have been reported to show facial expression recognition and discrimination (Ahrens, 1954; Charlesworth & Kreutzer, 1973). Ekman, a psychologist interested in the relationship of emotions and facial expression, carried out cross

Comparing A Cell's Nucleus To The Fuse Box Of A House

1054 words - 4 pages it’s not made rite you have to re-make it. The same process happens in the smooth ER. Our comparison is between the cell membrane and the walls and roof of the house. The cell membrane protects, holds together, and is a barrier to things trying to get in or out. What passes through the cell membrane is determined by size, shape, and polarity. The smaller the molecule the easier it gets through the membrane. With a house structure it protects

Ability Of Estimating Size Essay

764 words - 4 pages had 5 seconds to estimate each object. Extraneous variable factors were eyesight, and light. The variable factors should be gender. The measurement units were centimeters. The length of the objectives, estimated by the subject was recorded, and the data put it in a table for analysis. This scientific research investigates whether gender is a factor which affects the ability of estimating size. As we all know, there are a lot of differences of